4-D Principle
Discover – 'phase of divergent thought' -identify a problem by analysing market data, trends and other information sources.
Define - filter - where the review, selection and discarding of ideas takes place.
Develop - the design team together with key internal partners refines one or more concepts that will address the problems or issues identified during the Discover and Define stages.
Deliver - the resulting product is finalised and launched in the relevant market